1 files changed, 319 insertions, 0 deletions

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
new file mode 100644
index 000000000000..c402192362c5
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
@@ -0,0 +1,319 @@
+/*
+ * Copyright (C) 2014 Traphandler
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/of_graph.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_panel.h>
+
+#include "atmel_hlcdc_dc.h"
+
+/**
+ * Atmel HLCDC RGB output mode
+ */
+enum atmel_hlcdc_connector_rgb_mode {
+	ATMEL_HLCDC_CONNECTOR_RGB444,
+	ATMEL_HLCDC_CONNECTOR_RGB565,
+	ATMEL_HLCDC_CONNECTOR_RGB666,
+	ATMEL_HLCDC_CONNECTOR_RGB888,
+};
+
+/**
+ * Atmel HLCDC RGB connector structure
+ *
+ * This structure stores RGB slave device information.
+ *
+ * @connector: DRM connector
+ * @encoder: DRM encoder
+ * @dc: pointer to the atmel_hlcdc_dc structure
+ * @dpms: current DPMS mode
+ */
+struct atmel_hlcdc_rgb_output {
+	struct drm_connector connector;
+	struct drm_encoder encoder;
+	struct atmel_hlcdc_dc *dc;
+	int dpms;
+};
+
+static inline struct atmel_hlcdc_rgb_output *
+drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
+{
+	return container_of(connector, struct atmel_hlcdc_rgb_output,
+			    connector);
+}
+
+static inline struct atmel_hlcdc_rgb_output *
+drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
+}
+
+/**
+ * Atmel HLCDC Panel device structure
+ *
+ * This structure is specialization of the slave device structure to
+ * interface with drm panels.
+ *
+ * @base: base slave device fields
+ * @panel: drm panel attached to this slave device
+ */
+struct atmel_hlcdc_panel {
+	struct atmel_hlcdc_rgb_output base;
+	struct drm_panel *panel;
+};
+
+static inline struct atmel_hlcdc_panel *
+atmel_hlcdc_rgb_output_to_panel(struct atmel_hlcdc_rgb_output *output)
+{
+	return container_of(output, struct atmel_hlcdc_panel, base);
+}
+
+static void atmel_hlcdc_panel_encoder_dpms(struct drm_encoder *encoder,
+					   int mode)
+{
+	struct atmel_hlcdc_rgb_output *rgb =
+			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
+	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
+
+	if (mode != DRM_MODE_DPMS_ON)
+		mode = DRM_MODE_DPMS_OFF;
+
+	if (mode == rgb->dpms)
+		return;
+
+	if (mode != DRM_MODE_DPMS_ON)
+		drm_panel_disable(panel->panel);
+	else
+		drm_panel_enable(panel->panel);
+
+	rgb->dpms = mode;
+}
+
+static bool
+atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
+				     const struct drm_display_mode *mode,
+				     struct drm_display_mode *adjusted)
+{
+	return true;
+}
+
+static void atmel_hlcdc_panel_encoder_prepare(struct drm_encoder *encoder)
+{
+	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+}
+
+static void atmel_hlcdc_panel_encoder_commit(struct drm_encoder *encoder)
+{
+	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void
+atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder,
+				 struct drm_display_mode *mode,
+				 struct drm_display_mode *adjusted)
+{
+	struct atmel_hlcdc_rgb_output *rgb =
+			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
+	struct drm_display_info *info = &rgb->connector.display_info;
+	unsigned int cfg;
+
+	cfg = 0;
+
+	if (info->num_bus_formats) {
+		switch (info->bus_formats[0]) {
+		case MEDIA_BUS_FMT_RGB666_1X18:
+			cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
+			break;
+		case MEDIA_BUS_FMT_RGB888_1X24:
+			cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
+			break;
+		default:
+			break;
+		}
+	}
+
+	regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
+			   ATMEL_HLCDC_MODE_MASK,
+			   cfg);
+}
+
+static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
+	.dpms = atmel_hlcdc_panel_encoder_dpms,
+	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
+	.prepare = atmel_hlcdc_panel_encoder_prepare,
+	.commit = atmel_hlcdc_panel_encoder_commit,
+	.mode_set = atmel_hlcdc_rgb_encoder_mode_set,
+};
+
+static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+	memset(encoder, 0, sizeof(*encoder));
+}
+
+static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
+	.destroy = atmel_hlcdc_rgb_encoder_destroy,
+};
+
+static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
+{
+	struct atmel_hlcdc_rgb_output *rgb =
+			drm_connector_to_atmel_hlcdc_rgb_output(connector);
+	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
+
+	return panel->panel->funcs->get_modes(panel->panel);
+}
+
+static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
+				      struct drm_display_mode *mode)
+{
+	struct atmel_hlcdc_rgb_output *rgb =
+			drm_connector_to_atmel_hlcdc_rgb_output(connector);
+
+	return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
+}
+
+
+
+static struct drm_encoder *
+atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
+{
+	struct atmel_hlcdc_rgb_output *rgb =
+			drm_connector_to_atmel_hlcdc_rgb_output(connector);
+
+	return &rgb->encoder;
+}
+
+static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
+	.get_modes = atmel_hlcdc_panel_get_modes,
+	.mode_valid = atmel_hlcdc_rgb_mode_valid,
+	.best_encoder = atmel_hlcdc_rgb_best_encoder,
+};
+
+static enum drm_connector_status
+atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
+{
+	return connector_status_connected;
+}
+
+static void
+atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
+{
+	struct atmel_hlcdc_rgb_output *rgb =
+			drm_connector_to_atmel_hlcdc_rgb_output(connector);
+	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
+
+	drm_panel_detach(panel->panel);
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.detect = atmel_hlcdc_panel_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = atmel_hlcdc_panel_connector_destroy,
+};
+
+static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
+					   struct of_endpoint *ep)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	struct device_node *np;
+	struct drm_panel *p = NULL;
+	struct atmel_hlcdc_panel *panel;
+	int ret;
+
+	np = of_graph_get_remote_port_parent(ep->local_node);
+	if (!np)
+		return -EINVAL;
+
+	p = of_drm_find_panel(np);
+	of_node_put(np);
+
+	if (!p)
+		return -EPROBE_DEFER;
+
+	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
+	if (!panel)
+		return -EINVAL;
+
+	panel->base.dpms = DRM_MODE_DPMS_OFF;
+
+	panel->base.dc = dc;
+
+	drm_encoder_helper_add(&panel->base.encoder,
+			       &atmel_hlcdc_panel_encoder_helper_funcs);
+	ret = drm_encoder_init(dev, &panel->base.encoder,
+			       &atmel_hlcdc_panel_encoder_funcs,
+			       DRM_MODE_ENCODER_LVDS);
+	if (ret)
+		return ret;
+
+	panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
+	panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
+	drm_connector_helper_add(&panel->base.connector,
+				 &atmel_hlcdc_panel_connector_helper_funcs);
+	ret = drm_connector_init(dev, &panel->base.connector,
+				 &atmel_hlcdc_panel_connector_funcs,
+				 DRM_MODE_CONNECTOR_LVDS);
+	if (ret)
+		goto err_encoder_cleanup;
+
+	drm_mode_connector_attach_encoder(&panel->base.connector,
+					  &panel->base.encoder);
+	panel->base.encoder.possible_crtcs = 0x1;
+
+	drm_panel_attach(p, &panel->base.connector);
+	panel->panel = p;
+
+	return 0;
+
+err_encoder_cleanup:
+	drm_encoder_cleanup(&panel->base.encoder);
+
+	return ret;
+}
+
+int atmel_hlcdc_create_outputs(struct drm_device *dev)
+{
+	struct device_node *port_np, *np;
+	struct of_endpoint ep;
+	int ret;
+
+	port_np = of_get_child_by_name(dev->dev->of_node, "port");
+	if (!port_np)
+		return -EINVAL;
+
+	np = of_get_child_by_name(port_np, "endpoint");
+	of_node_put(port_np);
+
+	if (!np)
+		return -EINVAL;
+
+	ret = of_graph_parse_endpoint(np, &ep);
+	of_node_put(port_np);
+
+	if (ret)
+		return ret;
+
+	/* We currently only support panel output */
+	return atmel_hlcdc_create_panel_output(dev, &ep);
+}